Effect of Processing Route on Microstructure and Mechanical Properties of a Ti-3Al-2.5V/TiB Composite

Abstract:

A Ti-3Al-2.5V matrix composite reinforced with 8.5 vol.% TiB was produced using a powder metallurgy route. Processing included the mechanical alloying of Ti-3Al-2.5V and TiB₂ powders and Hot Isostatic Pressing (HIP) of the resultant composite powders, to produce a dense billet. These billets were subsequently extruded and/or subjected to various Conversion Heat Treatments (CHT), to complete the transformation of the TiB₂ particles into TiB needles. The CHT was performed either before or after extrusion. Microstructures and tensile properties of the materials at each stage of the processing routes were investigated and compared to those of a non-reinforced Ti-3Al-2.5V material, manufactured by the same powder metallurgy route. It has been demonstrated that the processing routes have a great impact on the mechanical properties, through modifications of the matrix and reinforcement characteristics. Well-chosen processing routes lead to more ductile composites, though this gain in ductility leads to slightly lower stiffness and strength values. This study clearly demonstrates the possibility to produce, at an industrial scale, a ductile version of a highly reinforced titanium matrix composite, showing important application potential.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1950-1955
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1950
• Online since: December 2018
• Authors: Ludovic Ropars*, Moukrane Dehmas, Elisabeth Aeby-Gautier, David Tricker, Dominique Schuster, Sophie Gourdet
• Keywords: Microstructural Characterization, Tensile Properties, Ti-3Al-2_·5V, TiB, Titanium Matrix Composite

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[9] Unpublished results.

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